Proverbs 10:32

The lips of the righteous are occupied in acceptable things; but the mouth of the ungodly taketh them to the worst.

Ecclesiastes 12:10

His diligence was to find out acceptable words, right scripture, and the words of truth.

Proverbs 2:12

That thou mayest be delivered from the evil way, and from the man that speaketh froward things;

Proverbs 11:11

When the just are in wealth, the city prospereth; but when the ungodly have the rule, it decayeth.

Proverbs 12:6

The talking of the ungodly is how they may lay wait for blood; but the mouth of the righteous will deliver them.

Proverbs 12:18

A slanderous person pricketh like a sword; but a wise man's tongue is wholesome.

Proverbs 15:2

A wise tongue commendeth knowledge; a foolish mouth babbleth out nothing but foolishness.

Proverbs 15:28

A righteous man museth in his mind how to do good; but the mind of the ungodly imagineth how he may do harm.

Proverbs 18:6-8

A fool's lips are ever brawling, and his mouth provoketh unto battle.

Ecclesiastes 10:12

The words out of a wise man's mouth are gracious, but the lips of a fool will destroy himself.

Daniel 4:27

Wherefore, O king, be content with my counsel, that thou mayest lose thy sins with righteousness, and thine offenses with mercy to poor people: for such things shall prolong thy peace."

Titus 2:8

and with the wholesome word which cannot be rebuked, that he which withstandeth may be ashamed, having no thing in you that he may dispraise.

Treasury of Scripture Knowledge

Summary

The lips of the righteous know what is acceptable: but the mouth of the wicked speaketh frowardness.

General references

Bible References

Know

Ecclesiastes 12:10
His diligence was to find out acceptable words, right scripture, and the words of truth.
Daniel 4:27
Wherefore, O king, be content with my counsel, that thou mayest lose thy sins with righteousness, and thine offenses with mercy to poor people: for such things shall prolong thy peace."
Titus 2:8
and with the wholesome word which cannot be rebuked, that he which withstandeth may be ashamed, having no thing in you that he may dispraise.

General references

Matthew 15:18
But those things which proceed out of the mouth come from the heart, and they defile the man.